title: Non-Debye normalization of the glass vibrational density of states in mildly densified silicate glasses.
abstract: The evolution of the boson peak with densification at medium densification rates (up to 2.3%) in silicate glasses was followed through heat capacity measurements and low frequency Raman scattering. It is shown that the decrease of the boson peak induced by densification does not conform to that expected from a continuous medium; rather it follows a two step behaviour. The comparison of the heat capacity data with the Raman data shows that the light-vibration coupling coefficient is almost unaffected in this densification regime. These results are discussed in relation to the inhomogeneity of the glass elastic network at the nanometre scale.
authors.affiliation: Laboratoire de Physico-Chimie des Matériaux Luminescents, Université de Lyon, Université Claude Bernard Lyon 1, UMR 5620 CNRS, 69622 Villeurbanne, France.
authors.forename: B
authors.initials: B
authors.lastname: Mantisi
authors.forename: S
authors.initials: S
authors.lastname: Adichtchev
authors.forename: S
authors.initials: S
authors.lastname: Sirotkin
authors.forename: L
authors.initials: L
authors.lastname: Rafaelly
authors.forename: L
authors.initials: L
authors.lastname: Wondraczek
authors.forename: H
authors.initials: H
authors.lastname: Behrens
authors.forename: C
authors.initials: C
authors.lastname: Marcenat
authors.forename: N V
authors.initials: NV
authors.lastname: Surovtsev
authors.forename: A
authors.initials: A
authors.lastname: Pillonnet
authors.forename: E
authors.initials: E
authors.lastname: Duval
authors.forename: B
authors.initials: B
authors.lastname: Champagnon
authors.forename: A
authors.initials: A
authors.lastname: Mermet